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This content comes from a Full-Text Transcript of the program.

BRIAN WILLIAMS, anchor:A military investigation has found no major mistakes were made in the August operation in
Afghanistan
that ended with a
Chinook
twin rotor helicopter being shot down killing 30 Americans, including those 22
Navy SEALs
. No disciplinary action's being taken against anyone involved. One military official called it a standard mission during which a bad guy got off a lucky shot, hitting the helicopter's tail rotor with an
RPG
. Today's report won't be enough for some who thought the
Chinook
full of American personnel needed more force protection around it and was exposed and open to enemy fire.